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Related Concept Videos

Types of Fluids01:27

Types of Fluids

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Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
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Flow Table Test01:12

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The flow table test is an established method used to assess the workability of concrete, particularly useful for evaluating highly flowable concrete mixes. This test employs an apparatus that consists of a wooden board topped with a steel plate, collectively weighing 35 pounds. The board is connected to a base via a hinge and measures 27.6 inches on each side.
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Characteristics of Fluids01:31

Characteristics of Fluids

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Fluids differ from solids primarily in their molecular structure and stress response. Solids have tightly packed molecules with strong intermolecular forces, maintaining their shape and resisting deformation. In contrast, fluids have molecules spaced farther apart with weaker forces, allowing them to flow and deform easily.
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Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
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Newtonian Fluid: Problem Solving01:18

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Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
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Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
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Flow and arrest in stressed granular materials.

Ishan Srivastava1, Leonardo E Silbert2, Jeremy B Lechman3

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Granular materials can suddenly stop flowing, causing issues in industry and nature. Simulations show flow-arrest transitions depend heavily on friction and dilation, revealing unique steady states under stress.

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Area of Science:

  • Physics of granular materials
  • Computational mechanics
  • Geophysics

Background:

  • Flowing granular materials can abruptly arrest, leading to significant economic and geophysical consequences.
  • Understanding these transitions is crucial for industrial processes and natural hazard mitigation.

Purpose of the Study:

  • To computationally investigate the steady states of flow and arrest in granular materials under applied stress.
  • To identify key parameters governing the transition between flowing and arrested states.

Main Methods:

  • Utilized discrete element simulations to model granular material behavior.
  • Simulated conditions of constant applied pressure and shear stress.
  • Analyzed material response including dilation, compaction, and structural anisotropy.

Main Results:

  • Identified uniquely-defined steady states of flow or arrest, highly sensitive to interparticle friction.
  • Flowing states characterized by volume fraction, coordination number, or internal stress ratio.
  • Shear arrest states require consideration of structural anisotropy in the contact network.

Conclusions:

  • Dilation plays a critical role in the flow-arrest transition of granular materials.
  • Findings provide insights into rheological transitions and the fundamental behavior of granular systems.